Drop py37 (#296)

Author: dcherian

.github/workflows/ci.yaml

@@ -21,7 +21,7 @@ jobs:
       fail-fast: false
       matrix:
         os: ["ubuntu-latest"]
-        python-version: ["3.7", "3.8", "3.9"]
+        python-version: ["3.8", "3.9", "3.10"]
     steps:
       - uses: actions/checkout@v3
       - uses: conda-incubator/setup-miniconda@v2

setup.cfg

@@ -8,10 +8,8 @@ description = A lightweight convenience wrapper for using CF attributes on xarra
 packages = cf_xarray
 zip_safe = False  # https://mypy.readthedocs.io/en/latest/installed_packages.html
 include_package_data = True
-python_requires = >=3.6
+python_requires = >=3.8
 install_requires =
-    numpy >= 1.15
-    pandas >= 0.25
     xarray
 setup_requires =
     setuptools >= 41.2